/*
 * Copyright (C) 2012 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package interactivespaces.util.graph;

/**
 * A {@link GraphWalkerObserver} which provides no nothing defaults for all
 * methods.
 * 
 * @author Keith M. Hughes
 */
public class BaseGraphWalkerObserver<Data> implements
		GraphWalkerObserver<Data> {

	@Override
	public void observeGraphNodeBefore(GraphNode<Data> node) {
		// Default is do nothing
	}

	@Override
	public void observeGraphNodeAfter(GraphNode<Data> node) {
		// Default is do nothing
	}

	@Override
	public void observeGraphEdge(GraphNode<Data> nodeFrom, GraphNode<Data> nodeTo,
			GraphEdgeClassification classification) {
		// Default is do nothing
	}
}
